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@with gisten geirrt @frn JAMES E. EMERSON, OF TRENTON, NEW`-JERSEY.

- Letters Patent No. 62,020, dated February 12, 1867.

IMPnov'sMnN'r in snws.

TO ALL WHOM IT MAY CONCERN:

Be it known thatI, JAMES El EMERSON, of Trenton, county of Mercenand' State of New Jersey, have invented a new and improved Method of Inserting Teeth in Saws; andrAI do hereby declare that the following is afnll and exact description thereof, reference being hadfto the accompanying drawings, and to the lettersof reference markedthereon. r

The nature oi"ny invention consists, first, in the manner of inserting and securing, permanently, rivets into either the saw-platevor. into the rear of the tooth, so that the projecting portion constitutes an equivalent for the dove-tail heretofore usedl for that purpose and second, leavinglin the corners of the otherwise square recess into which'the tooth is inserted, a fillet or portionof metal, and making the tooth of a correspondingshape.

Figures 1 and 2 are side views of a section of a saw-plate with the tooth in place. Y

l Figure 3, a similar section inperspective without the tooth -Figur-e 4, a perspective view ofa tooth.

. Figure 5, a different method of inserting teeth, but showing one feature` of my invention, the obtuse angles in the corners of the recess.

Figure @shows Aanother application-of the large rivet, in attaching a recess tooth to a projection on the sayvplate, for which I have already obtained a patent, using, however, the ordinary dove-tail instead pf the permanent rivet.i v

' In liga-1 and 3, the rivets in the joint'in the rear, and in iig. 6 in the front joint between the tooth and saw-plate, are shown with the greater part of their periphery surrounded by the metal of the saw-plate, and consequently iirmly held therein, while the smaller portion fitting into a corresponding recess in the tooth allows the latter to be removed-whenever'the small'rivet b' is driven ont. In iig. 2 the rivet-a is shown permanently secured to the tooth, and at a another method of securing the rivet, when equal portions are in the plate andv saw, by means of spurs, c c, formed bythe metal of the rivet being spread into notches formed in the plate for that purpose. Thlese'spursn consequence of their position relative to each other, form a dove-tail which effectually secures the rivet Vto whichever portion of `the saw it is desiredto v have it. yBy. this method of'inserting` teeth, the recess can becut out at one operation, and the formation ofthe usual `dove-tailedjoint between the saw-plate and tooth avoided, and the necessity of a millingl tool dispensed with, both recess, and thetooth te fit it, being cut or punched out by dies of corresponding shapes, the .holes for the rivetsbeing countersunkon both sides Vafter the toothis 'filled in ytherrecess,"and 'the' rivets are then inserted and swaged out to -ill their 4proper places. To remove the tooth "when word out, it is only necessary to Ydrive out the small rivet b, when thatpart of the'tooth secured by it can beforced to one side, clear of the saw-plate, and the shape of the large 'rivets allows its removal without `affecting the hold of thev large rivets in the plate'. 'The teeth to be inserted, corresponding of .course in shape end size of the parts to be inserted in the plates,1of those removed will iit the recess occupied by the latter, the permanent rivets constituting a dove-tail at once as durable, m'ore easily made,

and cheaper than any in' use. i Instead of making the bottom corners of the Vrecess square or right-angled, a portion of metal inthe shape of allet, d, (see i'igs. 1, 5, and 6,) is left in each corner, leavingthe jaws, or front and rear Walls of the recess', in case of the two former, of greater strength than if cut toa right or aciite angle, 'both of which tend, when made, to crack or split in the direction of the dotted lines e e. It `is apparent that the last feature of my invention can belapplied to diierent'methods of inserting or attaching teeth, as shown in rigs. 5 and 6,5 in the latter 'of which the fillets show two straight lines, forming, with' the sides o i' plate and the projecting part lling the recess in the tooth, three obtuse angles, or a polygonal shape.

` Having thus described my`invention, what I-claim as new, and desire to secure by Letters Patent, is

lThe method of: securing' teeth inserted in-or attached to a saw-plate, by forming the dove-tail of one or more rivets permanently secured either in the saw-plate or the tooth, in the mannerv substantially as shown-and' described.

` el'. E. EMERSON. i

i Witnesses:

EDM. F, BROWN, H. F. MANN. 

